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Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of long-term debt | $ 817.3 |  | $ 798.1 |  |  |
Long-term debt, net of debt issuance costs | 783.7 |  | 779.3 |  |  |
Derivative, Notional Amount | 2,300.0 |  | 2,070.0 |  |  |
Foreign currency forward contracts, net notional value | 860.0 |  | 1,210.0 |  |  |
Investments, Fair Value Disclosure | 795.5 |  | 740.8 | $ 792.8 |  | $ 794.9
Deferred compensation plan, contra-equity, shares held in trust | 12.1 |  | 10.4 |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 11.9 |  | 15.2 |  |  |
Derivative Asset, Fair Value, Gross Liability | 0.0 |  | (2.7) |  |  |
Derivative Liability, Fair Value, Gross Asset | (3.0) |  | (3.2) |  |  |
Derivative Liability, Fair Value, Gross Liability | 12.1 |  | 12.0 |  |  |
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments, Fair Value Disclosure | 368.3 |  | 321.8 |  |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments, Fair Value Disclosure | 0.0 |  | 0.0 |  |  |
Foreign currency forward contract, current asset amount | 11.9 |  | 12.5 |  |  |
Foreign currency forward contract, current liability amount | 9.1 |  | 8.8 |  |  |
Deferred compensation plan assets | 672.2 |  | 604.3 |  |  |
Deferred compensation plan liabilities | 645.9 |  | 576.1 |  |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments, Fair Value Disclosure | 378.8 | $ 367.8 | 367.3 | $ 64.2 | $ 438.1 | $ 452.0
Foreign currency forward contract, current asset amount | 0.0 |  | 0.0 |  |  |
Foreign currency forward contract, current liability amount | 0.0 |  | 0.0 |  |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  |
Deferred compensation plan liabilities | $ 0.0 |  | $ 0.0 |  |  |

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